
public class PercolationStats {
    private int size;
    private int times;
    /**
     * Perform T independent computational experiments on an N-by-N grid.
     * @param N -- size of grid. 
     * @param T -- times to repeat.
     */
    public PercolationStats(int N, int T)
    {
        if (N <= 0 || T <=0)
            throw new IllegalArgumentException();
        this.size = N;
        this.times = T;
    }

    /**
     * Sample mean of percolation threshold.
     * @return  the sample mean.
     */
    public double mean()
    {
        //TODO
        return 0.0;
    }
    
    /**
     * Sample standard deviation of percolation threshold.
     * @return  -- the sample standard deviation.
     */
    public double stddev()
    {
        //TODO
        return 0.0;
    }
    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub

    }
}
